diff --git a/library/Phue/Transport/Adapter/Curl.php b/library/Phue/Transport/Adapter/Curl.php
index a209f83..2878635 100644
--- a/library/Phue/Transport/Adapter/Curl.php
+++ b/library/Phue/Transport/Adapter/Curl.php
@@ -60,7 +60,8 @@ public function send($address, $method, $body = null)
         curl_setopt($this->curl, CURLOPT_HEADER, false);
         curl_setopt($this->curl, CURLOPT_RETURNTRANSFER, true);
         
-        if (strlen($body)) {
+        if (isset($body) && strlen($body)) {
+            curl_setopt($this->curl, CURLOPT_HTTPHEADER, array('Content-Type: application/json', 'Accept: application/json'));
             curl_setopt($this->curl, CURLOPT_POSTFIELDS, $body);
         }